Ice dam risk in Garfield, NJ
How often ice dams form in Garfield
4.7 dam days a winter
Low risk. On an ordinary house in Garfield, conditions for an ice dam come on about 4.7 days in a normal winter, mostly in February and January.
Garfield averages 28 inches of snow a year and about 24 days with snow on the ground. Most of it comes and goes within a few days. The conditions that make a dam need all three at once: snow, cold at the eave and heat above it.
What your attic does to that number in Garfield
| Attic | Dam days | Risk |
|---|---|---|
| Air-sealed and well insulated | 3.4 | Low |
| Typical, some insulation, not air-sealed | 4.7 | Low |
| Older or poorly insulated, warm attic | 6.3 | Moderate |
The attic matters less in Garfield than in colder towns: there are only 1.3 days a winter between a typical attic and a sealed one.
Preventing ice dams on a Garfield roof
- Check the gutters before the first snow and clear them, so meltwater has somewhere to go. If you see icicles thicker than a finger along the eave after a storm, that is the early sign to look at the attic.
Snowy places are not always the worst: why snowfall misleads.
Garfield winter, month by month
| Month | Snow (in) | Days on ground | Dam days |
|---|---|---|---|
| January | 8.0 | 7.8 | 1.9 |
| February | 8.4 | 8.5 | 1.9 |
| March | 4.7 | 3.4 | 0.4 |
| April | 0.7 | 0.2 | 0.0 |
| October | 0.2 | 0.1 | 0.0 |
| November | 0.3 | 0.2 | 0.0 |
| December | 5.9 | 3.3 | 0.5 |
Garfield next to nearby towns
Garfield ranks 56 of 116 New Jersey cities here for ice-dam days, behind Hopatcong at 14.7 days.
- Lodi, NJ 1 mi, 4.3 days
- Elmwood Park, NJ 2 mi, 4.7 days
- Wallington, NJ 2 mi, 4.7 days
- Passaic, NJ 2 mi, 4.7 days
- Hasbrouck Heights, NJ 2 mi, 4.3 days
Where these numbers come from
NOAA 1991–2020 climate normals from Harrison, 9.4 miles from Garfield. A dam day is a day with snow on the roof and freezing at the eave while heat or sun melts the snow above it. This describes a normal winter, not this one.